revision 8/3/2007 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007 ? www.seawardinc.com ? page 1 features ? 1.3v typical dropout at full load current ? fixed 1.2v 2% output voltage ? fast transient response ? output current limiting ? built-in thermal shutdown ? good noise rejection ? rugged 2kv esd withstand capability. ? available in sot223 packages. ? rohs compliant and 100% lead (pb)-free description SE1122 is a low dropout positive fixed-mode regulator with minimum of 1a output current capability. the product is specifically designed to provide well-regulated supply for low voltage ic applications such as high-speed bus termination and low current 1.2v logic supply. SE1122 is also well suited for other applications such as vga cards. SE1122 is guaranteed to have a typical 1.3v dropout at full load current making it ideal to provide well-regulated outputs of 1.2 output voltage with 2.7v input voltage supply. pin configuration ordering information device package v out SE1122 sot-223 (lead-free) fixed output voltages 1.2v application ? pc peripheral ? communication typical application
revision 8/3/2007 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007 ? www.seawardinc.com ? page 2 absolute maximum rating symbol parameter maximum units v in input supply voltage 12 v ja thermal resistance junction to ambient (sot-223) 60 c/w t j operating junction temperature range 0 to 125 c t stg storage temperature range -40 to 150 c t lead lead temperature (soldering 10 sec) 260 c electrical characteristic v in =2.8v, i out = 10ma, c in = 10f, c out = 10f, ta = 25c, unless otherwise specified. symbol parameter test condition min typ max units v o output voltage (1) 1.176 1.2 1.224 v v sr line regulation (1) 2.8v < vin < 12v -- 0.3 -- % v lr load regulation (1) 10ma i out 1a -- 0.5 -- % iq quiescent current 1.2 ma v d dropout voltage (2) i out = 1a -- 1.3 -- v i cl current limit 1.1 -- -- a t c temperature coefficient -- 0.02 -- %/c otp thermal protection -- 175 -- c v n rms output noise t a = 25c, 10hz f 10khz -- 0.003 -- %v o r a ripple rejection ratio f = 120hz, c out = 22 f (tantalum), (v in - v out ) = 3v, i out = 10ma -- 57 -- db notes: 1. low duty cycle pulse testing with which t j remains unchanged. 3. the dropout voltage is the input/output differential at which the circuit ceases to regulate against further reduction in input voltage. it is measured when the output voltage has dropped 2% from the nominal value obtained at v in = v out +vdropout.
revision 8/3/2007 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007 ? www.seawardinc.com ? page 3 psrr 0 10 20 30 40 50 60 70 10 100 1000 10000 frequency (hz) psrr (db) dropout voltage vs output current 1.00 1.05 1.10 1.15 1.20 1.25 1.30 0 200 400 600 800 1000 1200 output current (ma) dropout voltage (v)
revision 8/3/2007 preliminary and all contents are subject to change without prior notice. ? seaward electronics, inc., 2007 ? www.seawardinc.com ? page 4 outline drawing for sot-223 customer support seaward electronics incorporated ? china rm 1605, building 1, international pioneering park, #1 shangdi xinxi rd haidian district, beijing 100085, china tel: 86-10-8289-5700/01/05 fax: 86-10-8289-5706 seaward electronics corporation ? taiwan 2f, #181, sec. 3, minquan east rd, ta i p e i , ta i w a n r . o . c tel: 886-2-2712-0307 fax: 886-2-2712-0191 seaward electronics incorporated ? north america 1512 centre pointe dr. milpitas, ca95035, usa tel: 1-408-821-6600 last updated - 8/3/2007
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